Ductless / Re circulating Range Hoods

This ventilation concept would have to be one of the classic products devised to entice the unaware in a quick parting of their money.

To actually believe that recycled air similar to that on a space station was going to be possible from a simplistic device of little cost requires an incredible leap of faith.
Only the desperate, or totally ignorant, would entertain installing such a product in their home in the hope that it would meet their demands.

While the rest of the world is talking about fresh clean air and the need to ventilate correctly to improve healthy living, we have a product such as this being installed in kitchens, doing the opposite, with the justification that something is better than nothing.

Using a simple 250mm exhaust fan in the ceiling and ducted to the eaves is going to do a better job of ventilating the kitchen.

A high price to pay just to be confronted with the reality that separating cooking oils, moisture, and odours with a simple filter that would struggle to remove any of the abovementioned, partially and or successfully, if at all.

Anyone who does any cooking, having installed this concept, will soon discover that they need to continually wipe away oil film from the tops of their cupboards and continually open doors and windows to get the stench of cooking out of their kitchen before it turns rancid as old cooking odours do. Result, a smelly kitchen, and a dangerous one.
Should a cooking fire occur one would not have the time to put it out as the flames would spread rapidly along oil deposits not realized with a blazing inferno being quickly realized putting all occupants at risk.

The only way to reduce the incidence of a fire would be to clean the filters, and adjacent surfaces every time, every time one used the kitchen stove, particularly when cooking with oil, and the chances of that happening is zilch.

Using this type of equipment in rental properties should be of particular concern as very few tenants bother to acquaint themselves with the essential maintenance requirements.

And all of this because someone doesn't want to find a way to do what is necessary, and vent to atmosphere.

In a day and age where all is possible there are only two reasons why something is not done properly, the person

insolence doesn't want to or
ignorance doesn't know how to

Always duct to atmosphere either through roof or to eaves

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